Choose Fly.io Sprites when
- ▸Your apps already run on Fly.io and you want your agents' machines on the same platform.
§ 00Fly.io Sprites alternative
Server4Agent vs Fly.io Sprites: a computer for your agent, and the tools it ships
Your agent gets a persistent server it reaches over MCP: it writes code and files, runs programs and scripts, and keeps background jobs going. When you want a finished tool, our build agent ships it under a budget cap, private until you choose who can open it, as a project your team can take over.
Choose Server4Agent when
- ▸Your agent needs its own persistent server: to write code and files, run programs and scripts, and keep background jobs and schedules running.
- ▸You also want finished tools: our build agent ships them, private until you choose who can open them.
- ▸You start from the chat app you already use, or the dashboard. No terminal needed.
- ▸You want an account-wide budget cap, private-by-default projects, team-only access, and a handoff your engineers can open in a browser editor.
§ 01Feature comparison
Fly.io Sprites vs Server4Agent
A practical comparison for teams deciding where agent work should run and how it should become a shipped result.
Decision point
Fly.io Sprites
Server4Agent
What you get
Fly.io Sprites
A Linux computer for your agent to work in.Server4Agent
A persistent server your agent works on, plus a build agent that turns the work into a tool at a live link.Who builds
Fly.io Sprites
Your agent. You bring the coding agent and the harness.Server4Agent
Your own agent over MCP or REST, our managed build agent from a goal, or both. AI credits included for ours.What runs there
Fly.io Sprites
Whatever your agent installs and starts.Server4Agent
Code, files, programs and scripts your agent writes, background processes, scheduled jobs, and web apps at a stable URL.How you connect
Fly.io Sprites
CLI, REST API, SDKs and an MCP server.Server4Agent
MCP from any compatible assistant, REST, webhooks, or the dashboard. Nothing to install.Sharing
Fly.io Sprites
A URL per machine, private to your organization or public.Server4Agent
A stable URL per project: private by default, open to your team or named teammates, public when you choose.Spend
Fly.io Sprites
Metered by the hour for CPU, memory and storage, with plans that include an allowance.Server4Agent
Dollar credits included in every plan, and an account-wide budget cap that stops agent spend at the ceiling you set.Teams
Fly.io Sprites
Organizations.Server4Agent
Owner, admin, member and viewer roles, team-only links, and handoff to your engineers in a browser editor.Where it runs
Fly.io Sprites
Fly.io's platform.Server4Agent
Our managed platform, or your own cloud account on Enterprise.§ 02FAQ
Frequently asked questions about Server4Agent vs Fly.io Sprites
Short answers for teams comparing agent sandboxes, app builders, persistent servers, MCP hosting, deployment, and budget controls.
Is Server4Agent a Fly.io Sprites alternative?
Yes. Both give your agent a persistent computer to work on. Server4Agent adds what turns that work into something people use: a build agent, team-only or public links, a budget cap and team roles.
Can my own agent use the server directly?
Yes. Over MCP your agent writes code and files, runs commands, programs and scripts, and keeps background processes and scheduled jobs running; REST covers files and commands. Not everything it builds has to be a web app.
Do I need to bring my own agent?
No. Server4Agent includes a managed build agent and the AI credits it uses. Bring your own as well if you like: it works on the same server.
Can a non-technical teammate use it?
Yes. Connect the chat app you already use once, or type the goal in the dashboard. Nothing to install.
How do the pricing models differ?
Sprites meters the machine by the hour against a plan allowance, and the AI your own agent uses is a separate bill. Server4Agent plans include dollar credits, our build agent's AI included, and the budget cap you set on the account is the hard ceiling.
What happens to a tool after it is built?
It stays: a project with a stable URL, its files and its full history. Change it later by asking again, share it with your team or named teammates, or hand it to an engineer in a browser editor.
Is what I build private?
Yes. A new project serves nothing until you choose who may open it: your team, named teammates, or the public.
Still deciding?
Tell us what you are building, and we will show you how Server4Agent would ship it. We answer within one business day.